Design, Synthesis, and Anti-Inflammatory Activity of Functionalized 1,2,4,5-Tetrasubstituted-Pyrimidinone

Area of Science:

• Medicinal Chemistry
• Organic Synthesis
• Pharmacology

Background:

• Inflammation is a complex biological response implicated in numerous diseases.
• Developing novel anti-inflammatory agents with improved efficacy and safety profiles remains a critical challenge in drug discovery.

Purpose of the Study:

• To synthesize novel 5-amino pyrimidinone derivatives via an efficient aza-Michael addition reaction.
• To evaluate the anti-inflammatory potential of the synthesized compounds in vitro and in silico.

Main Methods:

• Aza-Michael addition reaction of 5-amino pyrimidinones with α, β-unsaturated olefins.
• In vitro anti-inflammatory screening using RAW264.7 macrophages stimulated with lipopolysaccharide (LPS).
• Assessment of nitric oxide (NO), interleukin-6 (IL-6), and tumor necrosis factor-α (TNF-α) production.
• Immunoblotting to determine i-NOS and COX-2 protein expression.
• Molecular docking studies to predict binding interactions.

Main Results:

• The aza-Michael addition yielded functionalized amino-pyrimidinone-based mono-adducts in good to excellent yields.
• Compounds 3d and 3f demonstrated significant anti-inflammatory activity by reducing NO, IL-6, and TNF-α production without affecting cell viability.
• 3d and 3f effectively downregulated the expression of inducible nitric oxide synthase (i-NOS) and cyclooxygenase-2 (COX-2) in LPS-activated macrophages.
• Molecular docking studies supported the in vitro findings, elucidating potential binding mechanisms.

Conclusions:

• Compounds 3d and 3f exhibit potent anti-inflammatory properties by modulating key inflammatory mediators and proteins.
• These pyrimidinone derivatives effectively attenuate LPS-induced inflammation in macrophages.
• 3d and 3f serve as promising structural leads for the development of novel anti-inflammatory therapeutics.